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To provide an answer for your original question, you will have to do some homework. Most theatrical fog machines use a water/glycol or a mineral oil mixture to produce fog. It is vaporized and discharged through a nozzle where it immediately condenses to fog. Water/glycol fog is much less likely to set off fire equipment compared to oil based. The main thing is what type of smoke detectors are present in the space. If they are the optical kind which sense particles in the air, you may have issues. If they are ionization type sensors, you will most likely have no problem at all. Of course, there is the possibility that the space has both!